修补丢失的代码文件

shandan-common/src/main/java/com/keyware/shandan/common/util/FileDownload.java

@@ -0,0 +1,50 @@
+package com.keyware.shandan.common.util;
+
+import javax.servlet.http.HttpServletResponse;
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+
+public class FileDownload {
+    public static String download(HttpServletResponse response, File file, boolean deleteFile) {
+        return download(response, file, file.getName(), deleteFile);
+    }
+
+    public static String download(HttpServletResponse response, File file, String fileName) {
+        return download(response, file, fileName, false);
+    }
+
+    public static String download(HttpServletResponse response, File file, String fileName, boolean deleteFile) {
+        try (BufferedInputStream bis = new BufferedInputStream(Files.newInputStream(file.toPath()));
+             OutputStream out = response.getOutputStream()) {
+            response.setCharacterEncoding("UTF-8");
+            response.setContentType("application/octet-stream");
+            byte[] fileNameBytes = fileName.getBytes(StandardCharsets.UTF_8);
+            response.setHeader("Content-disposition", "attachment;filename=" + new String(fileNameBytes, 0, fileNameBytes.length, StandardCharsets.ISO_8859_1));
+
+            byte[] buffer = new byte[1024];  // 缓冲区
+            int bytesToRead = 0;
+            // 通过循环将读入的Word文件的内容输出到浏览器中
+            while ((bytesToRead = bis.read(buffer)) != -1) {
+                out.write(buffer, 0, bytesToRead);
+                out.flush();
+            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        } finally {
+            if (deleteFile) {
+                try {
+                    Thread.sleep(100);
+                } catch (InterruptedException ignored) {
+                }
+                file.deleteOnExit();
+            }
+
+        }
+
+        return "download success";
+    }
+}